Pregnancy Conception Due Date Calculator

The most accurate pregnancy and conception due date calculator available online: Our formula estimates birth due date and date of conception using your unique cycle length, LMP and luteal phase.

Determine Pregnancy Due Date

Last Menstrual Period:        
                              (MM/DD/YYYY format)

Average Length of Cycles:      (22 to 45)
                              (defaults to 28)

Average Luteal Phase Length:   (9 to 16)
                              (defaults to 14)




Estimated Conception:         
Estimated Due Date:           
Estimated Fetal Age:

Free JavaScripts provided
by The JavaScript Source


And while it's exciting to have a date on the calendar to look forward to, it's important to remember even the most accurate pregnancy due date predictor is only an estimate. Some even call it a "guess date" instead!

Pregnancy and Due Date

Nature's timing operates on a normal curve and length of pregnancy gestation is no different. Understanding the limitations of birth and conception due date calculators will help you to enjoy the end of your pregnancy and avoid potentially unnecessary interventions, like inducing labor.

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